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How star-gazing helped scientists solve a centuries-old mystery

2018-10-12T11:27:46Z - The Conversation / The Next Web

For centuries, astronomers regarded it as the oldest known nova – a type of star explosion.
This hourglass is embedded within a larger hourglass seen in previous observations, and itself contains other structures – nested like a Russian doll.
A collision between a white dwarf and a brown dwarf would be spectacular.
The brown dwarf would be shredded by the much heavier and denser white dwarf.
Some of the shredded dwarf would rain down on the white dwarf and provide the fuel for a thermonuclear reaction.